<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
        "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
    <title>页面标题</title>
    <link href="./static/07.css" type="text/css" rel="stylesheet">
</head>
<body>
   <h2>css标题</h2>
   <p>这是标题</p>
   <h2>css标题</h2>
   <p>这是正文内容</p>

</body>
</html>